SPIRIT LAKE, Idaho -

Friends and family are trying to understand what happened to 18-year-old Luke Anana-Kuewa, whose body was found submerged in Spirit Lake over the weekend.

People who knew him say that Luke was going to start lifeguard training at Silverwood next month and that he loved football, working on cars and was well-loved by the people in his life.

Investigators meanwhile are trying to piece together a timeline of what happened to the teen, interviewing people who may have seen him before he ended up in the frigid waters of Spirit Lake.

At first rescue crews couldn't get to him because of ice that was still on the lake. When they got to him, they found his body partially submerged in water that was in the mid to low 30s.

"That's what investigators are trying to determine. Autopsy will be part of that, everybody involved who knew Luke, seen Luke in the last day, day before that are the people they will interview to put together a timeline of what happened, and when it happened," Major Ben Wolfinger with the Kootenai County Sheriff's Department said.

There's a trail near the spot where Anana-Kuewa was found and the sheriff's department said that a group of people walking along the shoreline found the young man in the water Sunday.